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te-te - 20 inch milimem depth of send end 10 inch Ninimem deiej. <br />gravel over under drain_ <br />Effective sand size 0.3 to 0.5 mm, _d. Gravel graded eed plaeed <br />as per Sec. 7602 e. 12 inches freeboard above sand. <br />f. Sight glass on waste discharge line. g. Air release valve et <br />high point of filter.. h. Adequate facilities with dosage control <br />for adding coagulating chemicals ahead of filter. <br />i. Filter piping valved for separate filter backwashing and filtration, <br />2. SEC. 7803 - DIATOMCEOUS EARTH FILTER <br />a. Filter rate - two gpm/sq. ft.,maximum of two and one half (2-ii)Rpm/sq, <br />if continuous feeding of filter aid material provided for. <br />b. Pools 2,000 sq. ft. or more and heavily used pools must have continuous <br />feeding of filter aid material at a minimum rate of 0.I pounds/sq. ft. <br />of filter area over a 24 hour period. Individual skim-filter units noi. <br />allowed on pools 2,000 sq. ft. or more. <br />c. Materials adequate to withstand normal use. <br />d. Provision for convenient filter cleaning. <br />e. Pressure-type unit's pump must deliver full required pressure at 60 <br />feet head loss and sixty percent (60%) or more of such capacity at <br />70 feet head loss. <br />3. SEC. 7804-0'11ER FILTERS •(Sufficient factual date shall be su'omil:ted to <br />the Health Department for approval or disapproval) <br />-7;13C7774-1/JADTNG POOL- CAPACITY GALS. <br />I.1.1x'uc,a .jupth at deep point, 18" at side walls, 12?, <br />T:117.9(3 t V./)..hoUt r or less turnover rate. 0E0.7831. <br />enlerIue et least 0.4 ppm at all times when in <br />- • r r (Her' -er!;ing pool water provided, <br />No direct connection of water system with pool water. (no 1103e filUrg or <br />arl re-ele7:cted by vacuum breaker). <br />Creuveeleet <br /> <br />no. eeee eci ei.ieded to V.B.' to enable hosing dowzi ef pool area, <br />SEC. 7799, <br />syste ty rjen. <br />water fvom w6-)._1, sanitary coneeecei.on meet 1-aee.'7, <br />ree" Guarded jet angle drinking fountains provided at aIl pools e:,cen when <br />7Trovi(Th0 in :,cia:7.-71t 1' tying quarters. SEC. 7798.